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Net Income (Loss) Per Share (Tables)
12 Months Ended
Dec. 31, 2020
Earnings Per Share [Abstract]  
Computation of Net Income (Loss) Per Share
The following table sets forth the computation of Net Income (Loss) Per Share for the years ended December 31, 2020, 2019 and 2018 (in thousands, except per share data):
 202020192018
Numerator for Basic and Diluted Earnings per Share -
Net Income (Loss)$(604,572)$2,734,910 $3,419,040 
Denominator for Basic Earnings per Share -   
Weighted Average Shares578,949 577,670 576,578 
Potential Dilutive Common Shares -   
Stock Options/SARs— 258 1,137 
Restricted Stock/Units and Performance Units— 2,849 2,726 
Denominator for Diluted Earnings per Share -   
Adjusted Diluted Weighted Average Shares578,949 580,777 580,441 
Net Income (Loss) Per Share   
Basic$(1.04)$4.73 $5.93 
Diluted$(1.04)$4.71 $5.89